http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57961
Bug ID: 57961
Summary: Excessive memory use with -O0 ?
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Created attachment 30540
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30540&action=edit
C source code
I just tried to compile the attached code with -O0. Over 4 Gig of RAM
seemed to be required to compile it with gcc trunk from 20130721, but
gcc 481 seems to compile it ok in 1 Gig.
[dcb@localhost foundBugs]$ (ulimit -v 4000000; /home/dcb/gcc/results/bin/gcc
-O0 -c bug115.c)
bug115.c: In function ‘VLparse’:
bug115.c:18324:9: warning: passing argument 1 of ‘VLerror’ discards ‘const’
qualifier from pointer target type [enabled by default]
VLerror (yymsgp);
^
bug115.c:4726:13: note: expected ‘char *’ but argument is of type ‘const char
*’
extern void VLerror( char* msg );
^
virtual memory exhausted: Cannot allocate memory
[dcb@localhost foundBugs]$ /home/dcb/gcc/results/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/home/dcb/gcc/results/bin/gcc
COLLECT_LTO_WRAPPER=/home/dcb/gcc/results/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../src/trunk/configure --prefix=/home/dcb/gcc/results
--enable-checking=yes --enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.9.0 20130721 (experimental) [trunk revision 193500] (GCC)
[dcb@localhost foundBugs]$ (ulimit -v 1000000; /usr/bin/gcc -O0 -c bug115.c)
bug115.c: In function ‘VLparse’:
bug115.c:18324:9: warning: passing argument 1 of ‘VLerror’ discards ‘const’
qualifier from pointer target type [enabled by default]
VLerror (yymsgp);
^
bug115.c:4726:13: note: expected ‘char *’ but argument is of type ‘const char
*’
extern void VLerror( char* msg );
^
[dcb@localhost foundBugs]$ /usr/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin
--enable-initfini-array --enable-java-awt=gtk --disable-dssi
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--with-isl=/builddir/build/BUILD/gcc-4.8.1-20130603/obj-x86_64-redhat-linux/isl-install
--with-cloog=/builddir/build/BUILD/gcc-4.8.1-20130603/obj-x86_64-redhat-linux/cloog-install
--with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.1 20130603 (Red Hat 4.8.1-1) (GCC)
[dcb@localhost foundBugs]$
Suggest code rework.
